A new class HΣ(τ,λ,δ;φ) of bi-univalent functions is introduced with claimed coefficient and Fekete-Szegö bounds via Faber polynomials, but Theorem 2.8 is misstated and its proof contains sign errors.
Duren, Univalent Functions
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Faber polynomial coefficient estimation of subclass of bi-subordinate univalent functions
A new class HΣ(τ,λ,δ;φ) of bi-univalent functions is introduced with claimed coefficient and Fekete-Szegö bounds via Faber polynomials, but Theorem 2.8 is misstated and its proof contains sign errors.